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Simplifying 5(1 + -3r) = -85 (1 * 5 + -3r * 5) = -85 (5 + -15r) = -85 Solving 5 + -15r = -85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -15r = -85 + -5 Combine like terms: 5 + -5 = 0 0 + -15r = -85 + -5 -15r = -85 + -5 Combine like terms: -85 + -5 = -90 -15r = -90 Divide each side by '-15'. r = 6 Simplifying r = 6
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